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Accelerated life tests of specimen heat pipe from Communication Technology Satellite (CTS) projectA gas-loaded variable conductance heat pipe of stainless steel with methanol working fluid identical to one now on the CTS satellite was life tested in the laboratory at accelerated conditions for 14 200 hours, equivalent to about 70 000 hours at flight conditions. The noncondensible gas inventory increased about 20 percent over the original charge. The observed gas increase is estimated to increase operating temperature by about 2.2 C, insufficient to harm the electronic gear cooled by the heat pipes in the satellite. Tests of maximum heat input against evaporator elevation agree well with the manufacturer's predictions.
Document ID
19780009398
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Tower, L. K. (NASA Lewis Research Center Cleveland, OH, United States)
Kaufman, W. B. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1977
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-TM-73846
E-9433
Accession Number
78N17341
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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